Best Includes Source SDK Games on Steam

Name Release Date Current Players All-Time Peak Rating
Left 4 Dead 2 Left 4 Dead 2 16 Nov, 2009 62 905 69 939 96.74
Garry's Mod Garry's Mod 29 Nov, 2006 27 745 38 330 96.04
Counter-Strike: Source Counter-Strike: Source 1 Nov, 2004 8 459 14 784 95.07
Left 4 Dead Left 4 Dead 17 Nov, 2008 2 166 2 213 94.63
No More Room in Hell No More Room in Hell 31 Oct, 2013 1 275 2 119 88.55
Half-Life 2 Half-Life 2 16 Nov, 2004 1 019 3 630 96.38
Portal Portal 10 Oct, 2007 755 2 092 97.17
Black Mesa Black Mesa 6 Mar, 2020 678 1 968 93.95
Alien Swarm: Reactive Drop Alien Swarm: Reactive Drop 20 Apr, 2017 361 664 92.75
Day of Defeat: Source Day of Defeat: Source 12 Jul, 2010 350 677 89.61
Half-Life 2: Episode Two Half-Life 2: Episode Two 10 Oct, 2007 223 530 95.15
Half-Life 2: Episode One Half-Life 2: Episode One 1 Jun, 2006 164 517 93.76
Half-Life 2: Deathmatch Half-Life 2: Deathmatch 1 Nov, 2004 163 274 88.45
Pool Nation FX Lite Pool Nation FX Lite 7 Dec, 2015 149 308 70.05
Astro Colony Astro Colony 7 Nov, 2022 116 742 79.32
Fistful of Frags Fistful of Frags 9 May, 2014 94 206 89.62
Selaco Selaco 30 May, 2024 45 1 104 89.76
Day of Infamy Day of Infamy 23 Mar, 2017 34 63 81.04
Zombie Panic! Source Zombie Panic! Source 3 Oct, 2008 31 74 82.24
BrainBread 2 BrainBread 2 9 Mar, 2022 22 25 71.51
Pirates, Vikings, and Knights II Pirates, Vikings, and Knights II 12 Feb, 2010 15 65 84.90
Battle Grounds III Battle Grounds III 30 Jun, 2019 12 162 82.86
Sunrise: survival Sunrise: survival 3 Aug, 2017 11 19 49.41
Double Action: Boogaloo Double Action: Boogaloo 23 Oct, 2014 11 27 90.37
Hidden Through Time 2: Discovery Hidden Through Time 2: Discovery To be announced 9 44 77.65
Absorber Absorber 9 Jul, 2023 6 70 71.15
Kreedz Climbing Kreedz Climbing 15 Jun, 2017 3 10 78.15
Star Crusade CCG Star Crusade CCG 7 Sep, 2016 1 1 77.03
Kingdom of Atham: Crown of the Champions Kingdom of Atham: Crown of the Champions 12 Jan, 2024 1 26 73.54
Feudal Friends Feudal Friends 17 Jul, 2023 1 501 59.27
AfterImpaKt AfterImpaKt Coming soon 0 0
Pathfinder Adventures - Character Alts 1 Pathfinder Adventures - Character Alts 1 15 Jun, 2017 0 0 0.00
Logistique Act. 1 Logistique Act. 1 12 Sep, 2020 0 0
CatClick CatClick 2 Aug, 2024 0 0
Pool Nation FX - Unlock Online Pool Nation FX - Unlock Online 7 Dec, 2015 0 0 66.76
Borderless Gaming - Donation #1 Borderless Gaming - Donation #1 7 Aug, 2015 0 0
Frame of Mind - A game of thoughts. Frame of Mind - A game of thoughts. Q4 2023 0 0
City of Ages: Picture Supportive Text MUD (server and client included) City of Ages: Picture Supportive Text MUD (server and client included) 13 Oct, 2017 0 1 70.08
Party Club Demo Party Club Demo 18 Jun, 2024 0 0
Pool Nation FX - Unlock Cues Pool Nation FX - Unlock Cues 7 Oct, 2015 0 0 0.00
Emoto Emoto 26 Sep, 2018 0 0 58.33
Evacuation Evacuation 6 Jan, 2023 0 0
Istrolid - Curves and Shadows Istrolid - Curves and Shadows 29 May, 2017 0 0
Escape And Build Escape And Build 3 Jun, 2024 0 0
Lost Squad Lost Squad Coming soon 0 0
forclaz - DLC 3 0 0
RedTower Demo RedTower Demo 19 Aug, 2022 0 0
Emperor Content Pack Emperor Content Pack 22 Jun, 2016 0 0
Questscape Questscape 2024 0 0
Blade Symphony Blade Symphony 7 May, 2014 0 26 64.55
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